BREWfractometer - 0-32% Brix and 1.000-1.140% Wort Specific Gravity ATC Refractometer - World's Most Accurate! Measures 0-32% Brix AND 1.000-1.140 Wort Specific Gravity (Corrected Scale!) Calibrate with Distilled Water - Works with Beer Wort and Grape Must Solid construction - 50% heavier than the cheap toy units out there. This is a QUALITY Refractometer! The BREWfractometer is the professional Brewers Choice! The WORLD's MOST Accurate Wort SG Scale! Comes in a PLASTIC HARD CASE! Not some cheesy soft case! (10) Year Warranty Against Defects!